Question

Rezolvati in multimea numerelor naturale inecuatiile:
a)x+4<(mai mic sau egal, are o linie dedesubt)7
b)11-x>5
c)18:x<(mai mic sau egal)2
d)x:3<4

Answer 1

a) x+4≤ 7
x≤7- 4
x≤ 3
x∈{-∞; 3]

b)11-x>5
11-5 > x
x< 6
x∈ {-∞; 5}

c) 18÷x ≤ 2
2x ≥ 18
x ≥ 9
x∈[ 9;+∞}

d)x÷3<4
x < 12
x∈ {-∞; 11}

Answer 2

$a) x+4 \leq 7 \\ x \leq 7-4 \\ x \leq 3 \\ x = 0,1,2,3 \\ b)11-x\ \textgreater \ 5 \\ 11-5\ \textgreater \ x \\ 6\ \textgreater \ x \\ x=0,1,2,3,4,5 \\ c)18:x \leq 2 \\ x=1,2 \\ d)x:3\ \textless \ 4 \\ x=0,3,6,9$